Vinyl plank flooring over concrete

Does not sound right to me.

Make sure you get every single tiny little pebble up before you do.

Their should be a vapor barrier under your slab

Not sure if the floor still requires one though

Not required under vinyl. Like others said, all blemishes in the concrete will show.

Appreciate the replies.

It's in a commercial space. It had carpet glued down, which we had removed. The concrete is flat and in good condition. The flooring we got is pretty thick, like laminate.

Yes that's right. We hired a professional and had it installed throughout our house

LINKuse the 235 or the 280 you won't find this at lowes just roll it on easy also do not use the crap adhesive from lowes buy it from Loba

Some people aren't familiar with the vinyl plank. They probably think you mean peel and pray style.
If your doing the half inch stuff that is going to replace laminate floors soon, I would recommend a pad like they use on laminate.
That floor, vinyl plank, is about to get real popular.

If you really mean vapor barrier, it's not necessary. If you are talking about an underlayment, however, that is something totally different. An underlayment is a sound barrier that is useful when installing plank on an upper floor to reduce sound transmission to the lower floor. Since you are installing this in a commercial space, it's probably not needed, either.

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Does that sound right?

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Yes because it's probably a direct glue down or the really cheap stuff is peel and stick.

I put vinyl wood planks in a lot of smaller specs I built and it will show every flaw in your slab so going through with a grinder and self-leveling cement might be a good idea.

Ignore djangochained laughing at you because he plays some big shot on here constantly trying to act like he is a mogul. Only new money with tiny penises or people that live well beyond their means act like he does. I'll let you guess which one he is. He also probably doesn't realize that some vinyl planks get into mid-tier real wood pricing because of the quality. The difference comes in with the installation labor.